:root{--bg:#0f1115;--fg:#eef0f4;--mut:#9aa3b2;--card:#1a1e26;--acc:#ffcc33;--ok:#2ecc71;--bad:#ff6b6b}
*{box-sizing:border-box}body{margin:0;font:17px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg)}
main{max-width:680px;margin:0 auto;padding:16px}a{color:var(--acc)}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid #222;position:sticky;top:0;background:var(--bg);z-index:2}
.brand{font-weight:800;text-decoration:none;color:var(--fg)}.hud span{margin-left:10px;font-size:14px;color:var(--mut)}
.hero{text-align:center;padding:24px 0}.hero h1{font-size:28px;line-height:1.2;margin:0 0 8px}.hero p{color:var(--mut)}
.btn{display:inline-block;background:var(--acc);color:#111;font-weight:700;border:0;border-radius:12px;padding:14px 20px;text-decoration:none;font-size:17px;cursor:pointer;margin-top:12px}
.ghost{background:none;border:1px solid #444;color:var(--fg);border-radius:10px;padding:10px 14px;cursor:pointer;text-decoration:none;display:inline-block}
.card{display:block;background:var(--card);border-radius:14px;padding:16px;margin:12px 0;text-decoration:none;color:var(--fg)}.card span{color:var(--mut);font-size:14px}
.items{padding-left:18px}.items li{margin:6px 0}
.play h2{font-size:22px;line-height:1.3}.meta{color:var(--mut);font-size:14px}
.opts{display:grid;gap:10px}.opt{text-align:left;background:var(--card);color:var(--fg);border:2px solid #2a303b;border-radius:12px;padding:16px;font-size:17px;cursor:pointer;min-height:56px}
.opt.right{border-color:var(--ok)}.opt.wrong{border-color:var(--bad)}.opt.dim{opacity:.5}
.reveal{background:#151a22;border-left:4px solid var(--acc);border-radius:10px;padding:14px;margin-top:14px}.verdict{font-weight:700}.verdict span{color:var(--acc);font-weight:600;margin-left:6px}
.src{font-size:14px}.spark textarea{width:100%;min-height:70px;margin:8px 0;background:var(--bg);color:var(--fg);border:1px solid #333;border-radius:8px;padding:8px}
.signup{background:var(--card);border-radius:14px;padding:16px;margin:28px 0}.signup input[type=email]{width:100%;padding:12px;border-radius:10px;border:1px solid #333;background:var(--bg);color:var(--fg);font-size:16px}
.consent{display:block;font-size:13px;color:var(--mut);margin:8px 0}.note{color:var(--acc)}.crumb{font-size:14px}
.answers{margin-top:24px;color:var(--mut)}footer{text-align:center;color:var(--mut);padding:24px;font-size:14px}
/* ---- ad landing round (/<pack>/play/) ---- */
body.landing{background:linear-gradient(165deg,var(--c1) 0%,var(--c2) 100%) fixed;min-height:100vh;color:#fff;font-size:18px}
body.landing main{max-width:560px;padding:18px 16px 8px}
.lp{display:flex;flex-direction:column;gap:12px}
.lh{font-size:28px;line-height:1.15;margin:4px 0 0;font-weight:800;color:#fff}
.lv{font-size:18px;margin:0;color:#fff;font-weight:600}
.lcard{background:#fff;color:#111;border-radius:20px;padding:16px;box-shadow:0 10px 30px #0005}
.lqn{display:flex;justify-content:space-between;align-items:center;font-size:16px;font-weight:700;color:#333}
.lprog{display:flex;gap:6px}.lprog i{width:26px;height:8px;border-radius:9px;background:#ccc}.lprog i.d{background:#1b7f3a}.lprog i.c{background:#111}
.lq{font-size:24px;line-height:1.25;margin:10px 0 12px;font-weight:800;color:#111}
.lopts{display:grid;gap:10px}
.lopt{display:flex;gap:12px;align-items:center;text-align:left;width:100%;min-height:60px;padding:12px 14px;font-size:20px;line-height:1.25;font-weight:600;color:#111;background:#f4f4f6;border:2px solid #767676;border-radius:14px;cursor:pointer}
.lopt:hover:not(:disabled),.lopt:focus-visible{border-color:#111;outline:3px solid #111;outline-offset:1px}
.lopt .k{font-size:24px;flex:none}
.lopt.right{border-color:#1b7f3a;background:#e6f6ea;opacity:1}.lopt.wrong{border-color:#c62828;background:#fdecec;opacity:1}.lopt.dim{opacity:.55}.lopt:disabled{color:#111;cursor:default}
.lrev{background:#fff8e1;border:0;border-left:5px solid #b26a00;color:#111;border-radius:12px;padding:12px 14px;margin-top:12px}
.lrev .verdict{font-size:20px;margin:0 0 6px}.lins{font-size:18px;margin:0 0 6px}
.lrev .src{font-size:15px;margin:0 0 6px}.lrev .src a,.ldone a,.lsign a{color:#0b57d0}
.lbtn{display:block;width:100%;min-height:58px;margin-top:10px;background:#111;color:#fff;font-size:20px;font-weight:800;border:0;border-radius:14px;cursor:pointer}
.lbtn:disabled{background:#1b7f3a}
.lghost{display:block;text-align:center;margin-top:14px;font-size:18px;font-weight:700}
.ldone{text-align:center}.lscore{font-size:48px;font-weight:900;margin:0}
.lsaved{font-size:18px;margin:8px 0 0}
.lsign .signup{background:#f4f4f6;color:#111;text-align:left;margin:16px 0 0}
.lsign .signup h3{font-size:22px;margin:0 0 4px}.lsign .signup p{font-size:18px;margin:0 0 10px}
.lsign .signup input[type=email]{background:#fff;color:#111;border:2px solid #767676;font-size:18px;min-height:52px}
.lsign .consent{font-size:16px;color:#333}.lsign .consent input{width:20px;height:20px;vertical-align:middle}
.lsign .signup .btn{width:100%;min-height:56px;font-size:20px;background:#111;color:#fff}
.lf{padding:12px;font-size:14px}.lf a{color:#fff;opacity:.85}
@media (min-width:800px){body.landing main{padding-top:48px}.lh{font-size:34px}}
.lout{display:block;width:100%;min-height:56px;margin-top:14px;background:#fff;color:#111;font-size:20px;font-weight:700;border:2px solid #111;border-radius:14px;cursor:pointer}
.lout:disabled{border-color:#1b7f3a;color:#1b7f3a;cursor:default}
.lsign .signup .btn{background:#d63a00;color:#fff;font-weight:800;box-shadow:0 4px 12px #d63a0055}
.ldone-page .lf{display:none}